Using Ensemble Waveform Analysis to Compare Heat Assisted Magnetic Recording Characteristics of Modeled and Measured Signals
Using Ensemble Waveform Analysis to Compare Heat Assisted Magnetic Recording Characteristics of Modeled and Measured Signals
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DOI：
10.1109/tmag.2016.2612230
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发表时间：
2017-02-01
影响因子：
2.1
通讯作者：
Gage, Edward
中科院分区：
文献类型：
--
作者：
Hernandez, Stephanie;Lu, Pu-Ling;Gage, Edward
整体波形分析用于根据微磁建模的热辅助磁记录波形以及在驱动器和旋转支架级别测量的波形来计算信噪比 (SNR) 和其他记录特性。使用加窗函数可提供过渡 SNR 和剩磁 SNR 之间的细分。此外，可以使用双位提取方法从整体波形中提取通道位密度（CBD）。在恒定磁道宽度下，转变 SNR、剩磁 SNR 和 CBD 作为环境温度函数的趋势表明模型和测量之间具有良好的一致性。模型和驱动电平测量都显示在较高环境温度下信噪比下降，这可能是由于与轨道中心相比轨道边缘的下轨道轮廓发生变化。 CBD 作为跨轨道位置的函数也被计算用于建模和旋转支架测量。在测量和模型中观察到的高跨轨偏移下的 CBD 加宽与模型中观察到的写入过渡的曲率半径和所使用的热分布直接相关。
Ensemble waveform analysis is used to calculate signal to noise ratio (SNR) and other recording characteristics from micromagnetically modeled heat assisted magnetic recording waveforms and waveforms measured at both drive and spin-stand level. Using windowing functions provides the breakdown between transition and remanence SNRs. In addition, channel bit density (CBD) can be extracted from the ensemble waveforms using the di-bit extraction method. Trends in both transition SNR, remanence SNR, and CBD as a function of ambient temperature at constant track width showed good agreement between model and measurement. Both model and drive-level measurement show degradation in SNR at higher ambient temperatures, which may be due to changes in the down-track profile at the track edges compared with track center. CBD as a function of cross-track position is also calculated for both modeling and spin-stand measurements. The CBD widening at high cross-track offset, which is observed at both measurement and model, was directly related to the radius of curvature of the written transitions observed in the model and the thermal profiles used.